Grandma's Molasses 

The worst type of diarrhea imaginable. It wants to come out but it's too busy becoming an awful mess on the inner sides of your ass cheeks, and will not let go.

I'd really love to hang out with you tonight, but Grandma's Molasses has been plaguing me all day and it just won't end!

Grandma's Molasses by Bip Bip Daniels May 23, 2010

Grandpa Sauce 

Any secretion(s) that disperse from a man 60+ whether it be fecal matter, sweat, wax, cream, urine. That's Grandpa sauce.

"Mommy.. there's something coming out of grandpa.."
"It's alright hun, it's just Grandpa Sauce"

Grandpa Sauce by jennitals September 8, 2003

Out at Grandma's 

At the Stripclub or a place where your girlfriend might suspect you are cheating.

Fucking a girl that's not your Girlfriend.

Girl: "Where are you?"
Boyfriend videotaping naked girl: "Umm....I'm just Out at grandma's right now"
Girl: "Okay, honey."

Out at Grandma's by Choutzu July 8, 2010

Grandma's 3rd Leg

America's favorite improv/sketch comedy troupe.

Tonight I saw Grandma's 3rd Leg and laughed my ass off!

You should check out Grandma's 3rd Leg at www.grandmas3rdleg.com

Grandma's 3rd Leg by iwiac January 17, 2009

Grandma's Chicken Soup

The best inside joke ever created. It's derived from Friends, and isn't necessarily meant to be dirty, but comes up like that anyways

Person1: I really like pie. What's your favorite food?
Person2: Grandma's Chicken Soup...

Grandma's Chicken Soup by HardRockJudge5 March 8, 2017

Grandma's on the boat! 

1. A slang term for when a member of ones social circle engages in an act that they would typically be unwilling or unable to participate in due to various limitations.

2. An ironic expression intended to celebrate rowdy behavior by juxtaposing that behavior with the behavioral tendencies of the elderly and enfeebled.

Prsn1: Lets go into town for a late night pub crawl.
Prsn2: Okay, but you know I can't handle alcohol quite like I used to...
Prsn1: Grandma's on the boat!

Grandma's on the boat! by Epimone July 5, 2019

Watering your grandma’s garden 

A phrase used to give someone an excuse not to hangout because you are fucking someone

I can’t hang out because im watering your grandma’s garden (your can be replaced to make the sentence make sense)

Watering your grandma’s garden by Camryn and Conrad January 10, 2019